Epidemic and annual excess influenza-associated morbidity rates among the elderly (per 1,000).
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a Early appearance of antigenic-drifted strains: follow the results from Table S1.b Peak vaccine coverage in 2004: “Before” and “after” indicated influenza season before or after the peak vaccination coverage rate during 2003–2004 as shown in Fig 1.c Epidemic: isolation Rate >10%;d Annual: from September to the following August.
创建时间：
2015-12-02
